Tweet
Tweet

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Death, Taxes, and HTTP @JesseWilson @JakeWharton

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You

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Your Team

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Client

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Client

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Client Server

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Client Server

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Client Server

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Client Server

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Client Server

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Round-Trip Time Client Server

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RTT Client Server

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Client Server

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Client Server GET / HTTP/1.1

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Client Server GET / HTTP/1.1 HTTP/1.1 200 OK

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Client Server GET / HTTP/1.1 HTTP/1.1 200 OK

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Client Server GET / HTTP/1.1 HTTP/1.1 200 OK Transport Layer Security

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Client Server GET / HTTP/1.1 HTTP/1.1 200 OK TLS

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Client Server GET / HTTP/1.1 HTTP/1.1 200 OK TLS

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Client Server TLS v1.2

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Client Server TLS v1.2 U TLS?

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Client Server TLS v1.2 Ya. Here's my cert.

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Client Server TLS v1.2 Great. Key is hunter2

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Client Server TLS v1.2 I'm ready!

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Client Server TLS v1.2 GET / HTTP/1.1

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Client Server TLS v1.2 GET / HTTP/1.1 HTTP/1.1 200 OK

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Client Server TLS v1.2 w/ session resumption GET / HTTP/1.1 HTTP/1.1 200 OK

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GET / HTTP/1.1 HTTP/1.1 200 OK Client Server TLS v1.2 w/ session resumption

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Client Server TLS v1.2 w/ session resumption 3 GET / HTTP/1.1 HTTP/1.1 200 OK

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Client Server TLS v1.3

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Client Server TLS v1.3 TLS? Key is hunter2

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Client Server TLS v1.3 Ya. Here's my cert and key

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Client Server TLS v1.3 Let's go!

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Client Server TLS v1.3 GET / HTTP/1.1

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Client Server TLS v1.3 GET / HTTP/1.1 HTTP/1.1 200 OK

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Client Server TLS v1.3 w/ session resumption GET / HTTP/1.1 HTTP/1.1 200 OK

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Client Server TLS v1.3 w/ 0-RTT session resumption

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Client Server TLS v1.3 w/ 0-RTT session resumption

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Client Server TLS v1.3 w/ 0-RTT session resumption GET / HTTP/1.1

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Client Server TLS v1.3 w/ 0-RTT session resumption GET / HTTP/1.1

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Client Server TLS v1.3 w/ 0-RTT session resumption GET / HTTP/1.1 HTTP/1.1 200 OK

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Client Server TLS v1.3 w/ 0-RTT session resumption GET / HTTP/1.1 HTTP/1.1 200 OK

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Client Server TLS v1.3 w/ 0-RTT session resumption GET / HTTP/1.1 HTTP/1.1 200 OK

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RTT TLS v1.3 w/ 0-RTT session resumption TLS v1.3 w/ session resumption TLS v1.3 TLS v1.2 w/ session resumption TLS v1.2 2 1 1 1 0

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OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("https://twitter.com") .build(); Call call = client.newCall(request); Response response = call.execute(); System.out.println(response.handshake().tlsVersion());

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OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("https://twitter.com") .build(); Call call = client.newCall(request); Response response = call.execute(); System.out.println(response.handshake().tlsVersion());

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OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("https://twitter.com") .build(); Call call = client.newCall(request); Response response = call.execute(); System.out.println(response.handshake().tlsVersion()); TLS_1_2

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HTTP Client Server GET / HTTP/1.1 HTTP/1.1 200 OK

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HTTP Client Server GET / HTTP/1.1 HTTP/1.1 200 OK

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HTTP Client Server GET / HTTP/1.1 HTTP/1.1 200 OK

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HTTP Client Server GET / HTTP/1.1 HTTP/1.1 200 OK

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HTTP Server Client GET /YHTTP/1.1 HTTP/1.1 200 OK

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GET /YHTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"} HTTP

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/Y /payments.html /profile.html /login.html /settings.html /static/fonts/roboto.ttf /static/js/app.js /static/css/main.css /static/image/logo.png

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/Y /payments.html /profile.html /login.html /settings.html /static/fonts/roboto.ttf /static/js/app.js /static/css/main.css /static/image/logo.png /api/auth /api/user /api/payments /api/payments/1234 /api/settings

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Server Client GET /api/payments HTTP/1.1 200 OK

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Server Client GET /api/payments HTTP/1.1 200 OK

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Server Client GET /api/payments HTTP/1.1 200 OK

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Server Client GET /api/payments HTTP/1.1 200 OK

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Server Client GET /api/payments HTTP/1.1 200 OK

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Server Client GET /api/payments HTTP/1.1 200 OK

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Server Client GET /api/payments HTTP/1.1 200 OK

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.html

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.js .html .js .js .js .js .js .js

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.js .html .js .js .js .js .js .js .css .css .css .css

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.js .html .js .js .js .js .js .js .png .png .png .png .png .png .png .png .css .css .css .css

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.js .html .js .js .js .js .js .js .png .jpg .png .png .jpg .png .png .png .png .png .css .css .css .css

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.js .html .js .js .js .js .js .js .png .jpg .png .png .jpg .png .png .png .png .png .css .css .css .css 22 requests

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.js .html .js .js .js .js .js .js .png .jpg .png .png .jpg .png .png .png .png .png .css .css .css .css 16 requests

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.js .html .png .jpg .png .png .jpg .png .png .png .png .png .css .css .css .css 13 requests

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.js .html .png .jpg .png .png .jpg .png .css 6 requests .png .png .png .png

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No content

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.js .html .png .jpg .png .png .jpg .png .css 6 requests .png .png .png .png

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.js .html .jpg .jpg .png .css 1+3+2 requests example.com cdn.example.com images.example.com

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.js .html .jpg .jpg .png .css example.com cdn.example.com images.example.com

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.js .html .jpg .jpg .png .css example.com cdn.example.com images.example.com

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.js .html .jpg .jpg .png .css example.com cdn.example.com images.example.com .jpg .jpg .jpg .jpg .jpg .jpg

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.js .html .png .css example.com cdn.example.com images.example.com .jpg .jpg .jpg .jpg .jpg .jpg .jpg .jpg

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.js .html .png .css example.com cdn.example.com images1.example.com .jpg .jpg .jpg .jpg .jpg .jpg .jpg .jpg images2.example.com

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.js .html .png .css example.com cdn.example.com images1.example.com .jpg .jpg .jpg .jpg .jpg .jpg .jpg .jpg images2.example.com

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Server Client GET /api/payments HTTP/1.1 200 OK

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/api/payments [A 1234, 1275, 1690, 2641, 2903, 4991, 5312, 5319, 14328, 28321, 29948, 30991, 37174, 73572 ]B

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/api/payments [A 1234, 1275, 1690, 2641, 2903, 4991, 5312, 5319, 14328, 28321, 29948, 30991, 37174, 73572 ]B /api/payments/{id} {C id: 1234, amount: 4200, currency: "USD", initiator_id:F48818374, recipient_id:G24567654, initiated_at: 14764993868, completed_at: 14769455213 },Z

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/api/payments [A {C id: 1234, amount: 4200, currency: "USD", initiator:F{ id: 48818374, name: "Jake Wharton" }, recipient:G{ id: 24567654, name: "Jesse Wilson" }, initiated_at: 14764993868, completed_at: 14769455213 },Z ... /api/payments/{id} 1234 1275 1690, 2641, 2903, 4991, 5312, 5319, 14328,

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments?last=43163 HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments?last=43163 HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments?last=43163 HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments?last=43163 HTTP/1.1 200 OK

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HTTP/2 Client Server GET /api/payments?last=43163 HTTP/1.1 200 OK

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HTTP/1.1 GET /api/payments?last=43163 HTTP/1.1 200 OK GET /api/payments HTTP/1.1 200 OK HTTP/2

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HTTP/1.1 GET /api/payments?last=43163 HTTP/1.1 200 OK GET /api/payments HTTP/1.1 200 OK HTTP/2 time

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"} HTTP/1.1 HTTP/2 GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"}

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"} HTTP/1.1 HTTP/2 GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"}

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"}

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"}

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"} ID: 2 ID: 2

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"} ID: 2 ID: 2 GET /api/payments HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"} ID: 2 ID: 2 GET /api/payments HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"} ID: 2 ID: 2 GET /api/payments HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT {"id":1234,"amount":4200,"currency":"USD"} ID: 2 ID: 2

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 {"id":1234,"amount":4200,"currency":"USD"} ID: 2

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 {"id":1234,"amount":420 ID: 2 0,"currency":"USD"} ID: 2

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 {"id":1234,"amount":420 ID: 2 [1234,1275,1690,2641,2903,49 ID: 4

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 {"id":1234,"amount":420 ID: 2 0,"currency":"USD"} ID: 2

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 Host: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 0x25: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 0x25: square.com:443 User-Agent: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 Accept: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK Content-Type: application/json Content-Length: 42 E-Tag: "686897696a7c876b7e" Last-Modified: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: 0x02 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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GET / HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l Client Server HTTP/1.1 200 OK 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 ID: 2 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: 0x02 0x12: 0x03 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 4

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Client Server GET / HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 2 HTTP/1.1 200 OK 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: 0x02 0x12: 0x03 0x16: 0x04 ID: 4

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Client Server GET / HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 2 HTTP/1.1 200 OK 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: 0x02 0x12: 0x03 0x16: 0x04 ID: 4

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Client Server HTTP/1.1 200 OK 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 {"id":1234,"amount":420 ID: 2 0,"currency":"USD"} ID: 2 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: 0x02 0x12: 0x03 0x16: 0x04 HTTP/1.1 200 OK 0x1E: application/json 0x1B: 471 0x21: "ae7284b30ccc93" 0x2B: Wed, 19 Apr 2017 09:22:09 GMT ID: 4

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Client Server HTTP/1.1 200 OK 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 {"id":1234,"amount":420 ID: 2 0,"currency":"USD"} ID: 2 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: 0x02 0x12: 0x03 0x16: 0x04 HTTP/1.1 200 OK 0x1E: application/json 0x1B: 471 0x21: "ae7284b30ccc93" 0x2B: Wed, 19 Apr 2017 09:22:09 GMT ID: 4

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Client Server 0x08 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 {"id":1234,"amount":420 ID: 2 0,"currency":"USD"} ID: 2 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: 0x02 0x12: 0x03 0x16: 0x04 0x08 0x1E: application/json 0x1B: 471 0x21: "ae7284b30ccc93" 0x2B: Wed, 19 Apr 2017 09:22:09 GMT ID: 4

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Client Server 0x08 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 {"id":1234,"amount":420 ID: 2 0,"currency":"USD"} ID: 2 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: 0x02 0x12: 0x03 0x16: 0x04 0x08 0x1E: 0x1A 0x1B: 471 0x21: "ae7284b30ccc93" 0x2B: Wed, 19 Apr 2017 09:22:09 GMT ID: 4

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Client Server 0x08 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 {"id":1234,"amount":420 ID: 2 0,"currency":"USD"} ID: 2 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: 0x02 0x12: 0x03 0x16: 0x04 0x08 0x1E: 0x1A 0x1B: 471 0x21: "ae7284b30ccc93" 0x2B: Wed, 19 Apr 2017 09:22:09 GMT ID: 4

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Client Server ID: 2 GET / HTTP/1.1 0x25: square.com:443 0x39: okhttp/3.7.0 0x12: application/json 0x16: Basic QWxhZGRpbjpPcGVuU2VzYW1l ID: 2 0x08 0x1E: application/json 0x1B: 42 0x21: "686897696a7c876b7e" 0x2B: Thu, 20 Apr 2017 12:45:26 GMT ID: 2 {"id":1234,"amount":420 ID: 2 0,"currency":"USD"} ID: 4 GET /api/payments HTTP/1.1 0x25: 0x01 0x39: 0x02 0x12: 0x03 0x16: 0x04 ID: 4 0x08 0x1E: 0x1A 0x1B: 471 0x21: "ae7284b30ccc93" 0x2B: Wed, 19 Apr 2017 09:22:09 GMT

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OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("https://twitter.com") .build(); Call call = client.newCall(request); Response response = call.execute(); System.out.println(response.protocol());

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OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("https://twitter.com") .build(); Call call = client.newCall(request); Response response = call.execute(); System.out.println(response.protocol());

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OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder() .url("https://twitter.com") .build(); Call call = client.newCall(request); Response response = call.execute(); System.out.println(response.protocol()); h2

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Payloads {"id":1234,"amount":4200,"currency":"USD"}

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{"id":1234,"amount":4200,"currency":"USD"} JSON

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{"id":1234,"amount":4200,"currency":"USD"} JSON message Payment { string id = 1; int32 amount = 2; Currency currency = 3; } enum Currency { USD = 1; } Protocol Buffers

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{"id":1234,"amount":4200,"currency":"USD"} JSON message Payment { string id = 1; int32 amount = 2; Currency currency = 3; } enum Currency { USD = 1; } Protocol Buffers 1=1234 2=4200 3=1

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{"id":1234,"amount":4200,"currency":"USD"} JSON message Payment { string id = 1; int32 amount = 2; Currency currency = 3; } enum Currency { USD = 1; } Protocol Buffers 1=1234 2=4200 3=1 0104D20210680301

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{"id":1234,"amount":4200,"currency":"USD"} JSON message Payment { string id = 1; int32 amount = 2; Currency currency = 3; } enum Currency { USD = 1; } Protocol Buffers

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Y{"id":1234,"amount":4200,"currency":"USD"}Y

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Y{ "id":1234, "amount":4200, "currency":"USD" }Y

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Y{"id":1234,"amount":4200,"currency":"USD"}Y

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Y{"id":1234,"amount":4200,"currency":"USD"}Y

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Y{"id":1234,"amount":4200,"currency":"USD"}Y

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Y{"id":1234,"amount":4200,"currency":"USD"}Y

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Y{"id":1234,"amount":4200,"currency":"USD"}Y id

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Y{"id":1234,"amount":4200,"currency":"USD"}Y String(id)

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Y{"id":1234,"amount":4200,"currency":"USD"}Y String(id) Map>

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Y{"id":1234,"amount":4200,"currency":"USD"}Y String(id) Map> Adapter

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Y{"id":1234,"amount":4200,"currency":"USD"}Y String(id) Map> Adapter

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Y{"id":1234,"amount":4200,"currency":"USD"}Y String(id) Map> Adapter

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Y{"id":1234,"amount":4200,"currency":"USD"}Y String(id) Map> Adapter 1234L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(amount)

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(amount) Map>

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(amount) Map> Adapter

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(amount) Map> Adapter

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(amount) Map> Adapter

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(amount) Map> Adapter 4200L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L 4200L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L 4200L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L 4200L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L 4200L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(currency) 4200L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(currency) Map> 4200L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(currency) Map> Adapter 4200L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(currency) Map> Adapter 4200L

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(currency) Map> 4200L Adapter

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L String(currency) Map> 4200L 4200L Adapter CurrencyCode.USD

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L 4200L CurrencyCode.USD

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L 4200L CurrencyCode.USD

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Y{"id":1234,"amount":4200,"currency":"USD"}Y 1234L 4200L CurrencyCode.USD

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[ Y{"id":1234,"amount":4200,"currency":"USD"},Y {"id":1275,"amount":10000,"currency":"USD"}, {"id":1690,"amount":834,"currency":"USD"}, {"id":2641,"amount":2448,"currency":"USD"}, {"id":2903,"amount":11305,"currency":"USD"}, {"id":4991,"amount":566,"currency":"USD"}, {"id":5312,"amount":702,"currency":"USD"}, {"id":5319,"amount":3885,"currency":"USD"}, {"id":14328,"amount":34400,"currency":"USD"}, {"id":28321,"amount":892,"currency":"USD"}, {"id":29948,"amount":2261,"currency":"USD"}, {"id":30991,"amount":6600,"currency":"USD"}, {"id":37174,"amount":939,"currency":"USD"}, {"id":73572,"amount":40000,"currency":"USD"} ]

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Y{"id":1234,"amount":4200,"currency":"USD"}Y

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id")

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id")

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id")

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id")

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id")

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id")

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id")

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id")

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id") Adapter Adapter Adapter

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id") Adapter Adapter Adapter

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id") Adapter Adapter Adapter

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Y{"id":1234,"amount":4200,"currency":"USD"}Y ByteString("amount") ByteString("currency") ByteString("id") Adapter Adapter Adapter Adapter

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[ Y{"id":1234,"amount":4200,"currency":"USD"},Y {"id":1275,"amount":10000,"currency":"USD"}, {"id":1690,"amount":834,"currency":"USD"}, {"id":2641,"amount":2448,"currency":"USD"}, {"id":2903,"amount":11305,"currency":"USD"}, {"id":4991,"amount":566,"currency":"USD"}, {"id":5312,"amount":702,"currency":"USD"}, {"id":5319,"amount":3885,"currency":"USD"}, {"id":14328,"amount":34400,"currency":"USD"}, ByteString("amount") ByteString("currency") ByteString("id") Adapter Adapter Adapter Adapter

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github.com/square/moshi

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WebSocket Client Server

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WebSocket Client Server GET / HTTP/1.1 Sprechen sie websocket?

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WebSocket Client Server GET / HTTP/1.1 HTTP/1.1 101 ¡Sí!

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WebSocket Client Server GET / HTTP/1.1 HTTP/1.1 101

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WebSocket Client Server GET / HTTP/1.1 HTTP/1.1 101

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WebSocket Client Server GET / HTTP/1.1 HTTP/1.1 101

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No content

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Death, Taxes, and HTTP @JesseWilson @JakeWharton